A crushed stone screening and crushing plant is a facility that processes natural stones (limestone, granite, basalt, gravel, etc.) by crushing and screening them to produce crushed stone (aggregate). Crushed stone is one of the fundamental materials used in the construction sector for concrete production, road construction, asphalt production, and many other applications. These plants crush stones into specific sizes to make them suitable for construction projects.

How Does it Work?

  1. Feeding Unit:

    • Natural stones or large rock pieces are loaded into the feeding hopper.

    • Material from the feeding hopper is transferred to the crusher using a vibrating feeder or scraper. This ensures a smooth flow of material to the crusher.

  2. Crushing Process:

    • Primary Crusher: Material is first sent to the primary crusher (usually a jaw crusher or impact crusher). At this stage, large stones are broken into smaller pieces (approximately 100-200 mm).

    • Secondary Crusher: Material from the primary crusher is sent to the secondary crusher (cone crusher or impact crusher). Here, the material is reduced to smaller sizes (25-60 mm).

    • Tertiary Crusher (Optional): If fine material production is required, a tertiary crusher is used. At this stage, the material is crushed to a range of 5-25 mm.

  3. Screening Process:

    • Crushed material is passed through vibrating screens to separate it into different sizes.

    • Screens classify the material into desired sizes (e.g., 0-5 mm, 5-12 mm, 12-25 mm).

    • Material that does not meet the desired size is sent back for further crushing.

  4. Storage and Shipment:

    • Sized material is stored in stockpiles.

    • Material is shipped to construction sites or sales points using conveyor belts or trucks.

Working Principle:

  • Crushers: Break stones into smaller pieces. Primary, secondary, and tertiary crushers are used.

  • Screening Machines: Separate materials by size. Vibrating screens are the most commonly used equipment.

  • Conveyor Belts: Transport materials within the plant.

  • Control Systems: Ensure automatic operation and increase efficiency.

Advantages:

  • High efficiency and low operating costs.

  • Flexibility to produce crushed stone of different sizes.

  • Provides continuous and high-quality material to the construction sector.

  • Mobile plants can be easily set up in different locations.